Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23366cb674b69ae…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 20:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a3a411ed89249e2df2a703a6b5f09f6 SHA-1: 79c986f12db326d2ad3db5ac4cd846c42970db5d SHA-256: e23366cb674b69ae88d024b3f388bbca5e0681fef278eeb2fbe3628b16f89ed6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The primary URL suggests a phishing lure related to finding social media passwords. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=find+someone%27s+instagram+password PDF link annotation
    • https://nhanloc.net/userfiles/file/binofezotifaxapuserumudo.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/tobitazutaraliwedad.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/97274842969.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/wobofuxawozenaneduvetav.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///22750073431.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/40175466021.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/70054368394.pdfIn PDF document text
    • http://esteel.my/userfiles/file/dogodozopizasusi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/nexuturupudakexoxexoboseb.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/024cbe0b8878126d3b08cd8909dcd91d/vevobiwitomewegorug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/026359682b8660d424aa0459df9dca49/49289905700.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3741193483.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dazaguzuz.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/90366163286.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23725489692.pdfIn PDF document text
    • http://parilka.by/var/upload/file/80662429794.pdfIn PDF document text
    • http://foxadv.net/file/wekafurarimimedalinimo.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/46178642821.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/dafabasota.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/46317087326.pdfIn PDF document text
    • http://detectiveoffice.net/userfiles/file/lenabumopubazonefujakuv.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/79583582085.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/34713196291.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/lugefu.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/liliwevajusuwamili.pdfIn PDF document text
    • http://dasbluemchen.com/1887732956.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 18184 bytes
SHA-256: d843e702f180ab89c6f733f2c3f2e9efe8a10791fe615b02a154646e39527c9b
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10784 bytes
SHA-256: af7349d74cf3fae34229180a0907f8224fd44ada6a51cd8bc27effb13f68350a